Dialogs: fix compiler warning

StandardButton is a 32-bit type again.

Change-Id: I8aba4150cee169ef837891e9d72a64d48db32346
Reviewed-by: Liang Qi <liang.qi@digia.com>

src/dialogs/qquickdialog.cpp

@@ -212,7 +212,7 @@ void QQuickDialog::click(QPlatformDialogHelper::StandardButton button, QPlatform
         emit reset();
         break;
     default:
-        qWarning("unhandled MessageDialog button %d with role %ld", button, role);
+        qWarning("unhandled MessageDialog button %d with role %d", (int)button, (int)role);
     }
 }